Vaitai (back) is unlikely to play again this season after he underwent surgery in September, Kyle Meinke of MLive.com reports.

Vaitai (back) underwent surgery earlier this week, Tim Twentyman of the Lions' official site reports.

Lions head coach Dan Campbell said Wednesday that Vaitai is dealing with a back injury, Colton Pouncy of The Athletic reports.

The Lions placed Vaitai (undisclosed) on injured reserve Monday.

Vaitai was activated from the reserve/COVID-19 list Monday.

The Lions placed Vaitai (undisclosed) on the reserve/COVID-19 list Wednesday.

Vaitai (concussion) was a full participant in practice Wednesday, Tim Twentyman of the Lions' official site reports.

Vaitai (concussion) has been ruled out for Thursday's game against the Bears.

Vaitai (concussion) will not return Sunday against the Browns.

Vaitai left Sunday's game against the Browns and is being evaluated for a concussion.